
Hard water often proves unsuitable for many industrial and domestic purposes. When we describe water as ‘hard,’ we mean it contains excessive calcium (Ca) and magnesium (Mg) ions compared to normal water. We classify carbonate hardness as temporary hardness and non-carbonate hardness as permanent hardness. The water’s hardness increases as more calcium and magnesium ions dissolve into it. These ions originate from limestone sediments and carbon dioxide present in all exposed waters, particularly groundwater. The ion exchange process provides the simplest method to soften hard water.

The ion exchange process, used for softening water, involves resin and is among the most common and easiest methods for removing hardness (calcium and magnesium) from water. The process exchanges undesirable ions for more desirable ones. Raw water containing hardness passes through a bed of cation resin in sodium form. The resin takes up the hardness ions (Ca and Mg) while relinquishing sodium ions. This process, known as the service cycle, softens the hard water.
Ca (HCO3)2 + Na2 R = RCa + NaHCO3
CaSO4 + Na2 R = RCa + Na2SO4MgCl2 + Na2
R = RMg + NaCl
The resin continues to soften raw water until exhaustion occurs. Regeneration of the resin restores it to its original form. Sodium chloride (NaCl) solution, or common salt, is used to regenerate the resin. This solution is stored in the regeneration tank. During regeneration, the ejector tube injects the salt solution into the softener. The NaCl solution replaces Ca and Mg (hardness ions) from the resin. Regeneration is performed daily, every few days, or weekly, depending on the usage and design of the water softener plant.
RCa + NaCl = RNa + CaCl2
RMg + NaCl = RNa + MgCl2
Our NATSOFT water softener plants consist of a pressure vessel made of mild steel, stainless steel, or FRP, along with a regeneration tank, ejector assembly, and frontal piping work. Manual or automatic multi-port valves, butterfly valves, or conventional valves facilitate easy operation and control. These plants are available in capacities ranging from 1,000 liters per hour to 1,000,000 liters per day.
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